Electronic structure, irreversibility line and magnetoresistance of Cu0.3Bi2Se3 superconductor

Hemian, Yi; Gu, Genda; Chen, Chao -Yu; Sun, Xuan; Xie, Zhuo -Jin; Feng, Ya; Liang, Ai -Ji; Peng, Ying -Ying; He, Shao -Long; Zhao, Lin; Liu, Guo -Dong; Dong, Xiao -Li; Zhang, Jun; Chen, Chuang -Tian; Xu, Zu -Yan; Zhou, X. -J.

doi:10.1088/0256-307X/32/6/067401

Title: Electronic structure, irreversibility line and magnetoresistance of Cu_0.3Bi₂Se₃ superconductor

Journal Article · Mon Jun 01 00:00:00 EDT 2015 · Chinese Physics Letters

DOI:https://doi.org/10.1088/0256-307X/32/6/067401· OSTI ID:1226053

Hemian, Yi ^[1]; Gu, Genda ^[2]; Chen, Chao -Yu ^[1]; Sun, Xuan ^[1]; Xie, Zhuo -Jin ^[1]; Feng, Ya ^[1]; Liang, Ai -Ji ^[1]; Peng, Ying -Ying ^[1]; He, Shao -Long ^[1]; Zhao, Lin ^[1]; Liu, Guo -Dong ^[1]; Dong, Xiao -Li ^[1]; Zhang, Jun ^[1]; Chen, Chuang -Tian ^[1]; Xu, Zu -Yan ^[1]; Zhou, X. -J. ^[3]

Chinese Academy of Sciences (CAS), Beijing (China)
Brookhaven National Lab. (BNL), Upton, NY (United States)
Chinese Academy of Sciences (CAS), Beijing (China); Collaborative Innovation Center of Quantum Matter, Beijing (China)

Cu_xBi₂Se₃ is a superconductor that is a potential candidate for topological superconductors. We report our laser-based angle-resolved photoemission measurement on the electronic structure of the Cu_xBi₂Se₃ superconductor, and a detailed magneto-resistance measurement in both normal and superconducting states. We find that the topological surface state of the pristine Bi₂Se₃ topological insulator remains robust after the Cu-intercalation, while the Dirac cone location moves downward due to electron doping. Detailed measurements on the magnetic field-dependence of the resistance in the superconducting state establishes an irreversibility line and gives a value of the upper critical field at zero temperature of ~4000 Oe for the Cu_0.3Bi₂Se₃ superconductor with a middle point T_c of 1.9K. The relation between the upper critical field Hc2 and temperature T is different from the usual scaling relation found in cuprates and in other kinds of superconductors. Small positive magneto-resistance is observed in Cu_0.3Bi₂Se₃ superconductors up to room temperature. As a result, these observations provide useful information for further study of this possible candidate for topological superconductors.

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Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC00112704

OSTI ID:: 1226053

Report Number(s):: BNL-108429-2015-JA; R&D Project: PO010; KC0201060

Journal Information:: Chinese Physics Letters, Vol. 32, Issue 6; ISSN 0256-307X

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 2 works

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